Pandora Users Listening More

Pandora Media Inc. said more listeners tuned in to its online radio service and listened to more hours of music in March compared with a year earlier, a trend that should continue to push royalty costs higher for the music-streaming business.

Listener hours during March rose 40% from a year ago to 1.49 billion, while the share of total U.S. radio listening for Pandora in March was 8.05%, an increase from 5.73% at the same time last...